TV Ratings: 'Big Brother,' 'Wife Swap,' 'Whodunnit' Drop on Sunday

CBS scored a modest win with Big Brother's Sunday premiere. The reality series topped the night with adults 18-49, averaging a 1.7 rating in the key demo, though it was down by six-tenths of a point from last summer's Sunday premiere and five-tenths from last week's opener. Averaged in with encores, including a relatively strong rebroadcast of the Under the Dome premiere (1.1 adults), CBS averaged a 1.1 rating with adults 18-49 and 5.6 million viewers.